Rock-soil rheological test method

Abstract

The invention discloses a rock-soil rheological test method. Pressure is applied onto a rock-soil test piece which is arranged inside a pressure chamber so as to simulate different stress field environments of the rock and soil, a real variation situation of the rock and soil in different stress field environments can be evaluated by detecting variation parameters of the rock-soil test piece in the above environment, an axial pressure and a radial pressure born by the rock-soil test piece are mutually isolated, so that the axial pressure and the radial pressure are independent from each other. The axial pressure and the radial pressure of the rock-soil test piece in the pressure chamber are absolutely isolated, so that the axial pressure and the radial pressure are independent from each other, comparison between different numerical values of the radial pressure and the axial pressure of the rock-soil test piece can be realized by respectively applying the axial pressure and the radial pressure so as to simulate a stress field of the rock and soil under different situations such as tensioning of the rock and soil.

Description

technical field [0001] The invention relates to a rock-soil rheological test method. Background technique [0002] The rheological properties of rock and soil mainly include creep properties and force relaxation properties. The study of rock and soil rheological properties is very important for the quality control of geotechnical engineering, safe operation, soft rock support, and rock and soil mechanics research, especially for deep geotechnical engineering. Engineering and geomechanics are more important. The research on the rheological properties of rock and soil mainly focuses on the study of the rock and soil failure mechanism, in order to promote the improvement of the quality control of geotechnical engineering, safe operation and the level of soft rock support. At present, the test of rock and soil rheology mainly uses a triaxial rheometer, which can apply pressure to the radial and axial directions of the rock and soil, but the radial pressure and the axial pressur...

AI Technical Summary

Problems solved by technology

At present, the rheological test of rock and soil mainly uses a triaxial rheometer, which can exert pressure on the rock and soil in the radial and axial directions, but the radial pressure and the axial pressure interfere with each other, so the axial Pressure and radial pressure cannot be independent

In the actual failure process of rock and soil, rock and soil tension and shear stress are the main reasons for rock and soil damage. During the rock and soil tension process, the axial force is smaller than the radial force, and the current triaxial rheometer It can realize that the axial force of the rock and soil specimen is greater than the radial force, because when the traditional triaxial rheometer is used for the triaxial test, the entire specimen bears the working oil pressure inside the pressure chamber (customarily called hydrostatic pressure) -"Archimedes' Law"), the axial pressure of the specimen includes the pressure inside the pressure chamber in addition to the pressure exerted by the axial loading system. When the pressure of the axial loading system is zero, the axial pressure of the specimen still bears the pressure inside the pressure chamber working oil pressure, it is impossible to realize that the radial pressure of the specimen is greater than the axial pressure, so it is impossible to simulate the stress field when the rock and soil are stretched, which greatly reduces the reference value of the rock and soil rheological test results

[0003] In addition, each group of rock and soil creep tests requires at least 5 specimens, and the test for each specimen ranges from dozens of hours to hundreds or even thousands of hours. It often takes several months to complete a set of tests, not only Delayed engineering requires the acquisition of data and consumes considerable manpower and financial resources

Using multiple sets of test equipment to conduct tests at the same time can reduce the period of completion of the test, but each set of test equipment needs to be equipped with an oil supply system, a power system and a test bench, all of which require high manufacturing costs, thus greatly increasing the cost of rock and soil. The cost of rheological testing, and a great waste of energy, is neither economical nor environmentally friendly

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